Mixing device



March 14, 1933. H. R. TUMIM 1,901,207v

' MIXING DEVICE a4 ausw@ mllll m Mw@ ATTORNEY Patented Mar. 14, 1933 UNITED STATES PATENTv OFFICE! HERBERT RYAN 'ruilt-IM,V or BUFFALQKNEW Yoitx, AssIGNOR TONAI'IONALANIIJN a CHEMICAL co.iNc.,fory NEWYYORK, N. Y., n CORPORATION or NEWv YORKV MIXING DEVICE Viippneaami'mea August 14.1.1930;Y serieu Noi 475,196.

This invention'relates to mixing apparatus ofthe rotary druintype and relates particularlyto improvements-in the construction of such apparatus to adapt the. same for the blending or mixing of dry powders without dusting and for discharging the mixed powders from the mixing chamber. f j

It is an Object of the present invention to provide a rotary'mixer having a discharging hopper which is fixed duringthe discharging operation, and wherein provision is made for misalinement ofV they rot-aryc'mixer and discharginghopper. It is .also an object to provide an. apparatus of the character described wherein the discharging hopper is rotatable with the rotary mixer during the mixing operation',V whereby the life of the..

operative connection betweenthesaid parts is prolonged. A further Objectis the prof vision of aclo'sure which is simple -in -construction and Operation for the rotary mixer to prevent dustingof the contents. Other objects will be apparent from a consideration of the following disclosure.

In accordance with the present invention the mixer comprises a rotary mixing chamber having a discharging hopper' which may rotated therewith during the mixing operation.. The .discharge hopper may be rotated by the mixing chamber through a suitable operative connection or it maybe rotated by independent operative means Means are provided for maintaining the discharging hopperV stationary kwhile the mixingl chamber is rotated during the discharging operation to discharge its contents. 'If desired, a closure may be provided for the'discharge opening ofthe mixing chamber to prevent dusting of material.V A movable chute, scoop or other suitable device directs the discharge of material through the discharging opening in the mixing chamber and the'discharge hopper. Y

In order that my invention will be more clearly understood, referenceis made tothe drawing which illustrate al preferred"4 embodiment of my invention and in which Figure 1 is a sectional view of the discharging device in position on a rotary mixer; Fig-f ure 2`isa sectional'view taken at right angles A and 4 illustrate modifications to Figurel Onthe line 2 2; and Figures 3,

of details of the apparatus. v

In the form of the invention illustrated in the drawing the .apparatus comprises aimix- 55;

ing chamber or drum 2 which may be-rotatedby-a pinion coacting with a spur gear mounted: on the drum (not shown) andi is supported upon the idling rollers 4 which engage the guide ring ortraok 6 secured to 60:*

the periphery of the mixing chamber.- The dischargeend 1 ofthe mixing drum has its central'portion cut away to provide a hole 3 for receiving a cover plate 8 having acent'ral discharge Opening 10 therein. pla-te Sis-provided with a flared collar 12 which extends outwardly from the opening 10 to provide a tapered seaton its inner surface' for the closure 40, which will be de-` sicbed'herenafter in greater detail,and al- .7`

lows delivery of-the discharging material;

from the discharge opening 1Q in the mixing chamber to the discharging hopper`14.

An annular bronze wear plate or journal.

The cover 2O is suitably secured to the extremity 7of 75"?" `the collar 12.,r The discharge hopper comn prises a drum shaped hollow head 14 havingy a centrally located opening 9] in onev end:`

thereof adapted to register with the mouth 11 ofthe collar 12. rounded by an annular step 13.` The discharge hopper 14 is carried by the collar 12 and. is retained in place by the annular retaining plate 18 whichis suitably secured to the step 13 on the discharge hopper 14. The. retaining plate 18 extends inwardly toen` circle the extremity 7 of the collar 12.and bears against the wear pla-te 20. A packing` chamber 15 is rabbetedv in the wall of: the 50.

opening 9 to receive a-gasket or packing ringv 22,:which bears against the wear plate 20 .tof prevent access of foreign matter thereto. A dust apron or sleeve 24 is secured tothe in-I terior face of the collar 12 and projectsiover the packing ring 22 and opening9 inthe discharge hopper14 to 'protect these partsA against entrance of foreign matter theretoz. A discharge 'opening 16 in the head'14 com municates `with the central opening 9 inthe 109 head 14 to permit discharge of material from the apparatus.

The opening in the cover plate 8 may i. be closed by the closure40 having a tapered face 17 which bears against the tapered seat 5 in the collar 12. rlheclosur-e40y has its Central portion thickened to form a hubA 26 which is bored at 19 and counterbored at 21 to permit insertion of the flanged bushing 42`-whichlis tightly wedged into bore 19 or otherwise fastened to hub 26 to rotate therewith. A shaft extending at one end.

31 threaded on the end 23 of the shafty 30,`

and held against rotation by a locking pin 128which prevents the-entrance of foreign matter between 'the shaft 30 and bushing 42.

It is therefore evident that the closure 40 (ia l with its bushing 42 is capable of free rota-- tionen the shaft30. The end wall 33 of the head v14 has a thickened portion 34 which y is bored andthreaded at 37 tolreceive the thread end 32 ofthe shaft .30. rlhe end 23 of the shaft 30 `isrigidly secured to a hollowy shaft 44 by'coupling pinsf46 and eX- tends through thedrum 2` and is rotatably held atits other end by suitable means not shown. A dischargezchute or scoop 48 has athi'ckened hub portion 39 through which passes the hollow shaft 44 which-is rigidly secured thereto by pins 41. A hand wheel 36 -ffor operatingtheshaft.30 is suitably secured 'to the threaded end 32Vof the shaft 30, and a Ylock n ut 38isjcarriedby the shaft for locking the shaft vand hopper in fixed relationship. n'

In operation the head 14-is in operative engagement'with the collar 12 through the yielding operative connection comprising the sleeve 24, packing 22, retaining plate 18y and wear plate 20, and duringl the mixing operationthe head 14 is permitted to rotate in unison with themixing drum 2.

InlmiXing position the closure 40 will be retained in its seat 5 by pressure exerted through the screw 32 coacting with the threaded bore 37 in the end wall 33 in the head 14, and which is held against rotation relative to the head 14 by the lock nut 38v onthe shaft 30 turn-ed to bear tightly against the thickened abutment 34 in the end wall 33. YThe hollow shaft 44 being rigidly connected to the shaft`30, will rotate therewith and thereby revolve the discharge scoop'48 aboutk the hollow shaft 44 with which itis rigidly connected.

When'the mixed or blended powder is" ready to be discharged the rotation ofthe' drum 2 is`-stopped in such position by the operativethat the discharge opening 16 is turned downward. The discharge head 14 has one or more lugs 52 projecting from the side thereof which have a hole 43 bored therein to receive a locking pin 54. In discharging position, the lug 52 is adapted to be engaged by atoggle link 50 forked at one end to embrace the lug- 52and having the holes 47 and 49 in its prongs toregister with the hole43 in the lug 52. The opposite end of the toggle link 50 is hinged in a suitable manner to a second toggle link (notrshown) which in turnis pi'voted to the frame of the machine. The toggle link 5() is locked to the lug 52 by the locking pin 54 which passes through the holes 47 and 49 in the toggle link 50 and the hole 43 inthe lug 52 to hold the discharge head/*against rotation. The mixingdruinis nowr set in motion bytheoperative. Because the. operative connection between'thehead 14 anddrum 2 depends only on -frictional engagement ofthe compressed packing 22: against the sleeve 24, the drum 2 is capable of rotation' free of the discharge head.- In this position, the closure 40 which is held in frictional engagement with 4the seat 5 will rotate with the drum about the shaft. 30, which is locked against rotation by the lock nut- 38 coactingwiththe abutment 34. Of course, itfwill be understood that nif desired,vthe mixing operation may be carried out in this position, but since relative motion of .rotatingdrum 2; and @fixed discharge hopper 14 will result-.in wear on they packing 22, 'this practice, should be avoided as much as possible.

To discharge thee contents of the. drum the lock nut 38 is turned back slightly to release the shaft 30, and by turningthe hand wheel 36 theoperative may retract the shaft 30,

carrying the closure40 outof contact with its seat 5, and bringing the lower ed-ge of the scoop 48'into proximity with the discharge opening ,10, as shown in dotted vlines in- Figurel. f

Since the scoop 48 rotates with the shaft 30 'a 'suitable marker may be placed on `the hand wheel 36 to show lthe operative-when the. scoop" is in discharging position. The closure 40 yis locked in open position and the chute 48is locked in discharging lposition by turning the locking nut 38 against the abutment 34. The vanos in the drumy 2-will carry material to the top of the drum as the drum rotatesfromwhence it will drop into thescoop 48 and be directed through'the opening 10 and through the opening 16 intof a suitable receptacle.

The discharge hopper 14 may be used for charging the drum 2, or a separate manhole maybe provided in the drum for'j this purpose. For mixingmaterials in which dusting is not objectionable the closure 40 may be omitted, if desired, or the apparatus may be operated with the closure open and the 'discharge scoop 48 in inverted position.

1 In the-modification shown in Figure 3, the

through which the shaft passes. A spiderV on the wall 33 carries an abutment 58 having a threaded bore 57 therein for coacting with the thread .32 on the shaft 30.

Anfalternativeconnection betweenfthe distatable mixing drumhaving an .opening in K one end thereof, adischarge hopper, carried by said drum and rotatable therewith comy charge hopper 14 and the collar 12 is shown in Figure 4. rlhe packing chamber 15, in-

stead of being inthe face of the opening 9 as shown in Figure 1, lies in the step 13. The packing 62 is compressed by the retaining plate 18 against the wear plate 2O instead of being compressed against the sleeve 24 as shown in Figure 1. a i

The form of the apparatus illustrated ,in the drawing is a preferred embodiment ofimy invention shown in relationship with a mixing device of conventional design, and it is not intended that the invention should be limited to the specific device shown and described, except as defined by the-claims.

. I claim:

1. The combination comprising a lrotatable mixing chamber having a discharge opening at one end thereof providing a seat for a closure, a closure seated in the dischargev opening and rotatable therewith, a discharge hopper communicating with said opening and normaliy rotatable with Ythe mixing.

chamber, and means to hold` said discharge hopper in fixed position While the mixing chamber and closure rotate.

2. Thecombination comprising a rotatable mixing chamber having a discharge opening at one end thereof providing a closure seat, a closure seated in the discharge opening and rotatable therewith, a member rotatable with said mixing chamber supporting said closure, means for holding said member in fixed position whilesaid chamber and closure rotate, and means for moving the closure axially of the mixing chamber into or out of engagement with the closure seat while-the mixing chamber rotates,

3. The combination comprising a-rotatable mixing chamber-having a discharge opening at one end thereof formed to provide a closure seat, a closureseated in the closure seat and rotatable therewith, supporting means.

rotatable with the mixing chamber to support the closure and retain the closure in the seat, means to hold the supporting means in fixed position While the mixing chamber and closure rotate, and means for moving the closure into or out of engagement with the closure seatwhile the mixing chamberv ro-v tates.

4. The combination comprising a rotatable mixing chamber having a discharge opening at one end thereof, a discharge hopper carried by the mixing chamber in communication with the discharge opening, a closure supported by the discharge hopper and rotatable withsaid mixing chamber, means to men-t withthe discharge opening whilethe mixing chamber'rotates.= r 5. A mixing apparatus Vcomprising a ro-` municating with saidfopening, a shaft extending through said opening, a chutewith'- in said drum secured to said shaft andmovabletherewithfto direct material from fthe drum through the discharge opening, and

means for'holding. said `discharge hopper in a fixed'position while said; drum continuesto rotate.. i p y Y l 6. A mixing apparatusn comprising a rotatable mixing drum having a discharge opening inone end thereof, a discharge hopper carried bythe drumand rotatable therewith communicating with said opening, 'a shaft extending axially through said open-- ing and mounted infthe discharge hopper, a dischargingscoop within the drum and Asecured to said shaft, a closure for said-'opening mounted on said shaft and rotatable with said drum, means for holding the discharge hopper in a fixed position while said drum rotates, and means for moving` said shaft axially to,;move'said closure in and out of closing position-and to movesaid scoop in and out of discharging position.

7.- A mixing apparatus having in combination a rotatable drum having a discharge opening inione end thereof', aV discharge hopper carried by the drum communicatingwith the discharge opening, a yielding operative connectionbetweenthe drum and'said hopper to cause said hopper ,to rotate with the drum, means forrholding said discharge hopper stationarywhile the drum rotates, and ak discharge scoop withinthe drum and carried by thedischarge'hopper for directing the discharge of material through said opening. 8. A mixing apparatus having in' combination-a rotatable drum having a discharge opening in oneendthereof, a discharge hopper carried bythe drum and communicating with the discharge opening. a yielding oper-- ative connection between the drumand s aid hopper to cause said hopper to rotate with the drum, means for causing said operative connection to yield to-holdsaid hopper stationary while the drum rotates, a discharge scoop .within the drum todireCtthe'dis- 10fty charge of material through said opening, i

supporting means carried by said hopper for supporting the scoop, and meansfor-moving said scoop and supporting means into and out of discharging position.

` 9. Amixing apparatus comprising a horizontal rotatable drum havinga'coaxial discharge opening. inone en d thereof, a supporting collarsurrounding saidopening, a discharge hopper carried by said .collar and operatively connected thereto by ayielding con-v nection, a closure seated in said discharge opening and rotatable with said drum, supporting means for said closure locked to rotate with said discharge hopper, and means to cause said yielding'connection to yield.

10. Amixing device comprising a mixing chamber in the form of a horizontal rotatable cylinder,-a flared collar secured to' one end of the cylinder and provided with an opening positioned axially of the cylinder, a discharge hoppercarried by said collar rotatalble with said cylinder andmounted for rotationV 'with reference to said collar, means for preventing the passage of material 'be-A tween said collar and discharge hopper, and

means for holding thedischarge hopper sta- ,tionary while said cylinder continues to rotate.

l1. A mixing device comprising a mixing chamber in the form of a horizontal rotatable cylinder, a flared collar secured to one end of the cylinderand provided With an opening positioned axially of the cylinder, adischargehopper carried by said collar rotatable with said cylinder and mounted for rotation With reference to saidcollar, means for preventing the passage'of material between said collar and discharge hopper, a shaft secured to said discharge hopper and extending axially' through said opening, anda closure for said opening mounted on said shaft and rotatable with said cylinder.` Y

l2. A mixing device comprisinga rotatable mixing chamber having a lateral discharge opening therein, a discharge hopperin align-v ment With the discharge opening and rotatable relative thereto, means for coupling the. discharge hopper to the mixing chamber to Vcause rotation in unison therewith, and a chute Within the mixingchamber movable into and out of position to discharge material from said mixing chamber into said discharge hopper.

13. The combination which comprises a mixer having a discharge opening therein,

a discharge hopper aligned With a discharge openingfin the mixer positioned to receive material discharged from said mixer through said opening, said discharge hopper having a radially positioned outlet, means for permitting independent rotation of said'discharge hopper with respect to the, mixer, and means for coupling the discharge hopper to the mixer to cause rotation in unison therewith. t y

14. The combination Which comprises a mixer, a discharge hopper aligned with a discharge openingin the mixer, means for permitting independent rotation of said discharge hopper, a shaft passing axially through said hiopper, Y a closure member mounted Von said shaft, a Vchute mounted onj said shaft-and Within the mixer, means for imparting lateral movement to said shaft, and means for coupling the discharge hopper to vthe mixer to cause rotation in unison therewith.

15. The combination comprising a rotatable mixing chamberhaving a discharge opening therein, a discharge hopper carried by the mixing chamber and rotatable therewith, means Within vthe mixing chamber to direct material through the dischargeiopening, supporting means for said lirst mentioned means carried by the discharge hopper,means for locking said supporting means for rotation with said hopper, andmeans for holding said hopper in fixed position Avvhile the mixing chamber rotates.l Y 16. The Ycombination comprising a rotatablemixing chamber having a discharge opening therein, a discharge hopper positioned to receive material discharged from said mixing chamber through said opening, 'said hopper beingcarried by the mixing chamber and normally rotatable therewith, a discharge scoop carried in the mixing chamber, means rotatable relative to the discharge hopper for supporting the discharge scoop, and means vfor locking said First mentioned means to the discharge hopper to rotate there`` With. I i

17'. Amixing apparatus comprising a horizontal rotatable ,drumV having an opening iny one end thereofya cover plate secured to the drum over said opening and 'having-a discharge opening therein, a collar surrounding said discharge opening, a journal on said collar, a drumshaped discharge hopper having an opening in one end thereof registering With said discharge opening, a step on said discharge hopper surrounding saidfhopper opening, a retaining plate on said hopper to hold said hopper in position on'said collar, a sleeve lining for said collar and said hopper opening, a yielding friction coupling between said sleeve and said hopper, and means for holding said hopper in fixed position While said drum rotates. y

In Witness whereof I have hereunto lset myhand.

' HERBERT RYAN TUMIM. 

